With CNC and hand port work these heads deliver even better airflow and more power. Three credits got us through the entire day. (Photo Courtesy Ford Performance Parts). For those on a budget, any transmission from 1996 to current will technically bolt up to the Coyote engine, but it is strongly recommended to upgrade to the aforementioned T-56 6-speed or the TKO600 for manual options. From there they head for further testing on the dyno to verify CFM and airflow numbers and efficiency. This 5.0L coyote was a huge upgrade over the 2011-2014 Mustang GT Coyote of its time! Fasteners. The Shelby GT350 and R variants introduced a completely new approach to the Coyote engine. 55.9cc Chamber Volume (smaller versus 15-17 57cc) Sorry, flat-plane cranks are not expected from Ford Performance anytime soon. In addition to our MPR port job, we equipped the cylinder heads with a set of stock diameter Ferrea stainless-steel valves and finished off the valvetrain with a spring and tool-steel retainer kit from COMP Cams. 2 The Gen 2 heads can be used on the Gen 1 Coyote block as long as the Gen 2 Head Gasket (included in PN M-6067-A50) is used due to the oil feed hole Gen 2 Cylinder Head PN - There are aftermarket aluminum blocks that boldly expand the bore to 4.185, but this is considered the maximum. This version of the Coyote engine would rev past 7,000 RPM with ease and produced 444 horsepower! SBF SHP 205cc Aluminum Heads; GEN III LS NEXT. THESE HEADS ARE ON AN EXCHANGE PROGRAM. The JPC Racing Stage 2 and Stage 3 CNC-ported heads have aftermarket oversized valves and upgraded valvesprings. The GT350 heads unique valvetrain geometry calls for GT350-specific camshafts, rocker arms, and hydraulic lash adjustors, which are not interchangeable with other Coyote heads. On its website JPC says, The Stage 1 CNC-ported heads increase flow 9 to 14 percent (depends on lift) and utilize OEM valves, valvesprings, and retainers. be purged from the right hand cylinder head and provide sufficient coolant flow through the right hand cylinder head. The Road Runner Boss 302 5.0L engine, GT350 VooDoo 5.2L engine, and GT500 supercharged Predator 5.2 engine remain some of the most powerful engines that Ford has ever produced. If the Gen-3 head didnt have the direct injection and would fit on a Gen-1 or -2, it would really be the head to have. You'll be first to know about Race Pages Digital latest news! Equipped with the stock heads, this combination produced 515 hp and 450 lb-ft of torque. Coyote intake ports flow approximately 285 to 290 cfm stock, varying from casting to casting. A five-angle valve job is standard with all Stage 1 CNC-ported heads. To summarize their differences, camshaft profiles, changes in the intake manifold and other changes had the F-150 variant at 360 hp and 380 lb/ft of torque while the Gen 1 Coyote came in at 412 hp and 390 lb/ft. -Strength wise the Gen3 block is probably slightly better as it has longer 12mm head bolts vs the Gen2 11mm but has a more open deck. The BOSS head is cast of 356 aluminum alloy with a smattering of copper for both strength and good heat transfer. What brand and type of headers are you using? Having exhausted the basic bolt-ons, you might think we would be done with the Coyote, but youd be wrong. The Coyote heads development and execution was a remarkable turn of events for Ford because it had never been done. . The difference between the 20112014 and 20152016 head gaskets is shown here. Those numbers would be for both valves if they are correct. M-6049-M50B Ford Performance Right Cylinder Head What is needed to perform a coyote swap? Post author: Post published: June 8, 2022 Post category: what happened after mao zedong died Post comments: closing announcement target closing announcement target Although there are four basic factory cylinder head castings, the aftermarket offers different CNC porting styles you should be familiar with. It was as simple as sending out a mass email to the group for name ideas. (Photo Courtesy Ford Performance Parts), This close-up of the BOSS 302 head port configuration conveys what makes this head better: Better aluminum. Recommended for engines from 302-393 cubic inches, operating up to 6000-6500 RPM. by | Jun 10, 2022 | spider man: no way home mcu timeline | harmon killebrew autographed baseball value | Jun 10, 2022 | spider man: no way home mcu timeline | harmon killebrew autographed baseball value All rights reserved. A closer look at the Coyote cylinder head demonstrates the petite nature of this redesigned Modular head with its smaller valvetrain. I have a set of heads . Frankenstein Engine Dynamics, LLC. Performance & security by Cloudflare. Bearings. More power is good but more power everywhere is even better. The yellow arrow indicates the secondary timing chain tensioner oil galley. Fords Coyote engine is a real alternative to all of those who perform LS swaps in their cars. Using the stock retainers and keepers, the new springs offered 80 pounds of seat pressure and 200 pounds of open pressure. This is the revised 2015 Coyote cylinder head with revised high-flow intake ports, stiffer valvesprings, larger intake and exhaust valves, and a wider intake port flange for the CMCV induction system. Sold 09/07/2020. 5.0Resto, SVE, LMR are registered trademarks of Latemodel Restoration Supply, Inc. Ford, SVT, Special Vehicle Team, Ford Mustang, Ford Lightning, Mach 1, Mach-E, Shelby GT500, GT350, GT350R, New Edge, Boss 302, 5.0, Cobra R, Fox Body Mustang, Ghia, Turbo GT, SVT Cobra, Cobra Jet, Bullitt, California Special, Cobra, GT, V6, S197, SN95, S550, S650, Dark Horse, F-Series, F-150, Triton, F150 Raptor, Raptor, EcoBoost, Bronco, Bronco Sport, Badlands, Big Bend, Black Diamond, Outer Banks, Wildtrak, and Sasquatch are all registered trademarks of Ford Motor Company. Remaining inventories of new BOSS heads as well as used show up at swap meets and parts houses. You are using an out of date browser. 53cc 4V: 10.2:1. Our custom porting process is done using state-of-the-art CAD/CAM software to ensure maximum flow performance and consistency across all of our parts. Stock compression with stock shortblock, billet oil pump gears, comp cam stage 3's, cj manifold, e85. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. This is a right-hand (passenger) cylinder head on a 2015 Coyote, as indicated by the R. As with the left-hand (driver) cylinder head, there are intake and exhaust cam sensor ports. I don't have the link but I think Rick may have posted it. But rest assured, even at just 5.0 liters, the 5.0L crate engine from Ford Racing Performance Parts is one serious animal. Although you can bolt these heads onto the 5.0L block, consider building a 5.2L short-block to go with these heads due to valve shrouding issues with the 5.0L short-block. Thanks to the FRPP Controls Pack, the crate engine was a plug-and-play operation, including control over the drive-by-wire throttle and variable cam timing. The Gen 1 set the stage for all Coyote-based engines to follow 412 horsepower and 390 pound-feet of torque. Rcvd 01/05/2021. Answer inside this article! Part #1422 & 1492 are street legal in 50 states for 1995 and older emissions controlled vehicles under CARB EO #D-250-3. In 1995 Mark started photographing drag races at his once local track, Bradenton Motorsports Park. Total Engine Airflow CNC machines the intake and exhaust ports along with the combustion chambers. For the record, our runs on the stock heads and Meziere water pump were 604.1 horsepower and 485.2 lb-ft. We will safeguard your e-mail and only send content you request. Everything in the Coyotes cylinder heads had to be downsized to achieve a more petite cylinder head casting size. Electricity generation, as measured in gigawatt-hours, has gotten hammered by a near-stagnation in demand since 2007, as efforts to make everything more efficient have produced results for electricity users who'd invested in more efficient lights, appliances, electronic equipment, industrial . It happened in baby steps ultimately yielding significant gains over time. MMR stage 1 heads outflow the CNC boss ported head by 3% on both . Ford Performance is no longer producing the BOSS 302 cylinder head. There was a big debate among the group between naming it either Road Runner, Coyote, or other versions of Coyote but ultimately settled on the Coyote name that we love today. The result, regardless of how you look at it, is improved flow. While sharing the same name, these engines had some significant differences for their specific applications. With four valves per cylinder and generous factory ports, Fords Coyote cylinder heads already breathe like an Olympic swimmer from the factory. All rights reserved. Below are the differences between the 5.2 GT500 Predator engine compared to the 5.2L GT350 Voodoo engine. The one they decided to take was from John Norcott, who was one of their V-8 engine planners. From a flow rate standpoint, the stock heads offered 306 cfm while ported heads stepped things up with 338 cfm. Click to reveal Gen Gen 1 Gen 2 Gen 3 GT350 GT500 Quantity Add to Cart Frankenstein Engine Dynamics in association with Coyote Direct brings you the best cylinder head porting program for the Gen 1, Gen 2, Gen 3 Coyote and the GT350/GT500. Achieving this was no easy feat, and Ford has made significant upgrades compared to the 5.0L found in the GT. Ford engineers achieved improved flow by also lowering the port floor. The TFS heads generated peak flow numbers of 250 cfm (intake) and 193 cfm (exhaust). 2015 mustang These spring rates may not seem like much compared to race hardware for a traditional small-block, but remember, the Coyote sported four small valves compared to a pair of larger (and heavier) valves in the conventional small block. Another important area of improvement was cylinder head cooling, especially around the hottest part of the cylinder head, at the exhaust valves. It reminds me of a motorcycle valvetrain because it is so small. s197 Luke Many compare both the Pushrod vs Coyote motor so we have broken down everything you need to know when choosing the best engines for Fox Body Mustangs. It appears it was designed to flow well at .500" and that's about all in stock form. The cams increased horsepower substantially, especially when combined with a new air intake from JLT. Trick Flow Specialties is a leading designer and manufacturer of high performance cylinder heads, intake manifolds, and engine components. MMR stage 1 heads outflow th While it did borrow the same displacement as the Voodoo engine mentioned above, it did not bring over the flat-plane crank. Ford's clean slated approach with the Coyote saw huge differences between the original pushrod 5.0L 302 engine and the new DOHC 5.0L engine. The 2018-2019 Coyote, Gen 3 cylinder heads have further improved ports and larger valves - and flow as nearly as well as the GT350 5.2L CNC ported heads. A lot was learned from the GT500 head, yet none of it was carried directly over to the Coyote, according to Ford. While Im on the subject of cylinder head compatibility, also keep in mind that the 20152016 induction system is also different from 2011 to 2014 with ribbing that interferes with the 20112014 cylinder heads extended intake port flange. When we first started this Killer Coyote series, we wanted to illustrate as many of the performance components available, so we followed up with a bonanza of bolt-ons, including Zex nitrous, a Kenne Bell supercharger, and we even swapped the stock cams for a set of Stage 2 NSR grinds from Comp Cams (PN 191100). Build Thread and Video Build 5: 35 Hot Rod Truck #138. Cams are more vital if you're looking for instant gains based upon your current mod list in your signature. Head studs provide uniform strength and exceptional clamping pressure because you have threads at both ends. What would be best for an all out n/a build? Email address In fact, it was that turbo test that provided the motivation to install the CNC-ported heads for this test. They are a GT350 exclusive; you have to buy a GT350 to get one. An Evolution Performance and L&M Engines built GEN 1 5.0L Coyote engine powers Cyrneks Mustang. Because the Coyotes top end was designed more as a package than just cylinder heads, cam, and induction, it produces impressive airflow numbers rarely seen from a factory Ford engine. Look forward to hearing from you! However, if youre bolting these heads onto a 5.0L Coyote block, be advised that you will run into valve shrouding issues, which may limit power gains. This is also a CNC-machined intake port. Slawko Racing Heads is another source for CNC-ported Coyote cylinder heads that contributes a strong racing background and a wealth of experience. To see what our 2020 Shelby GT500 did on the dyno, be sure to watch the following video: 2020 Shelby GT500 On The Dyno. (Photo Courtesy Ford Performance Parts). Your IP: Ford calls the improved method cross-flow cooling; it eliminated the Modulars cooling tube in the valley. I used Gen1 timing procedures because my car is using a Gen1 ecu.. Gen 1 Coyote 5.0L Mustang 2011-12 GT - 412 hp @ 6,500 rpm - 390 ft.-lbs. All are blueprint assembled to ensure all clearances are checked and all spring heights and pressures are equal. True flow numbers are hard to come by. s550 mustang It is suggested that you head-stud your Coyote build unless youre planning in-vehicle head removal. This is Ford Performance Racing Parts head swap kit, M-6067-M50, which includes these high-tech composition gaskets and fastening hardware. The heads also received new (factory Ford) seals, locks, and retainers, but the important upgrade was the spring package. , By Wolf Richter for WOLF STREET. Gen 3 Coyote 5.0L engine - 2018-20 Mustang; 2018-20 F-150 Each new Coyote generation brought improvements in horsepower, torque, and even rpm capability. Mated to a new 10-speed automatic transmission, it drops the GT's -to-60 time to under 4 seconds when the pony car is set to Drag Strip mode." WHAT MAKES THE F150 COYOTE ENGINE DIFFERENT? What counts is what you get at the crank and rear wheels. engine. On the new S550 Shelby GT500, these monsters of an engine were mated to a Tremec 7-speed dual-clutch transmission to help ensure smooth and fast shifts. gen 3 coyote head flow numbers. Gen III Hemi Black Hawk Cylinder Heads SBC Eliminator - 23 Cylinder Head SBF Renegade - 20 Cylinder Head LS1 Mongoose - 15 Cylinder Head LS3 Mongoose - 12 Cylinder Head BBF Bullitt - 14 Cylinder Head BBC Magnum - 24 Cylinder Head BBC Magnum - 18 Cylinder Head Ford Performance Parts Gen 3 5.0L Coyote 460 HP Mustang long block crate engines are 32-valve DOHC V8s that use advanced features like direct and port fuel injection, twin independent variable camshaft timing (Ti-VCT . Fuel Injector Flow: 26 lb./hr. What are your goals for your vehicle MBA? Weatherford, TX 76088 Not a terrible difference but notable nonetheless! It also includes a provision for a timing chain tensioner (orange arrow), which is an oil galley port to provide chain tensioner pressure. In its simplest form, an engine is nothing more than an air pump. The as-cast port dimensions (170cc intake and 66cc exhaust) compared very favorably to the stock E7TE 5.0L head castings. You can copy and paste this link to share: https://www.diyford.com/ford-coyote-engine-cylinder-head-performance-guide/. PRO1. Palm Beach Dyno provided remote tuning services utilizing our HP Tuners MPVI2 dongle. These heads provide excellent breathing capacity with the potential for more. LS3 and 4L65E auto. Foyts race team. These are nice, handcrafted pieces that you can bolt onto your Coyote. The spark plugs are centered right in the middle of the action amid two 1.460-inch/37.0-mm intake and two 1.220-inch/31.0-mm exhaust valves. We've seen published numbers stating 265 cfm, and we've independently tested the stock pair off the '06 eBay . The new 5.0L coyote featured dual overhead cams, variable valve timing, higher compression, a strong aluminum block with deep-skirting, high flow heads, variable cam timing (Ti-VCT), a high flow composite intake, and tuned stainless steelheader style exhaust manifold! It was a wonderful touch to connect the beloved 80s and early 90s Mustangs with the new technology of Ford's pony car power plant! Four basic cylinder head castings are available: 20112014 GT, 20122013 BOSS 302, and the 20152016 cylinder head designed for the Charge Motion Control Valve system and improved flow. Well i was planning on doing just a cam swap but now with the stripped header bolt hole i am planning on having the heads ported while they are off. Slawko Racing Heads says these are the same CNC-ported Coyote heads used by Justin Cyrnek in his 2013 Mustang GT racecar. Greater runner length gives you better low-end torque. Foyt had a four-valve V8 back in 69 and was the 1st Ford 4 valve ever made. The GT350 head is a different casting entirely with its own valvetrain geometry, which does not interchange with other Coyote heads. that's right-we tested stock (as cast) gen 1 coyote heads vs cnc ported heads. Then you might be pretty excited about this ultimate 7.3L pushrod engine called the "Godzilla"! Gen 3 Coyote Mustang/F150 Throttle Body Mechanical Throttle Bodies TB Accessories, Gaskets, and Harnesses 26 Products VMP 105 MM Throttle Body for Dodge Hellcat 6.2 L SC $849.99 VMP 105 MM THROTTLE BODY FOR 2020 GT500 $999.99 VMP 105 mm Throttle Body Adapter Plate Kit - Black Anodized $99.99 We have made over 2000 HP with these heads set up just like this without a single issue. torque @ 4,250 2013-14 GT - 420 hp @ 6,500 rpm - 390 ft.-lbs. until someone does a head to head comparison (NOT the magazinesthey get paid by the people who port), its all speculation. Free delivery from 2 000,00 z . He became hooked and shot virtually every series at the track until 2007 until he moved to California and began working as a writer for Power Automedia. Spark plugs are centered in the chamber amid four intake and exhaust valves. Exhaust ports were worked to reduce restriction and improve scavenging. Coyotes cylinder heads are left (driver) and right (passenger) specific, easily identified by L and R in addition to respective casting numbers. The jump from a Gen 1 (2011-'14) to Gen 2 (2015-'17) Coyote wasn't a monumental leap in technology, but when it came to the Gen 3, that's a completely different story. "Flow numbers are just one variable used for various equations to analyze port characteristics in a very complex system. Stage 3 cam specs are 236/243 Intake and Exaust at .050" and only .492/.453 I/E lift. Designed for high rpm, the Boss lost power compared to the stock intake up to 6,500 rpm, but where the stock intake fell off, the power curve offered by the Boss kept climbing, right up to 7,500 rpm. Power wise id like to be in the 500whp range on 93oct and maybe 520ish on e85, mid 10s with a higher 120's trap speed would be what i would really be looking for. Look for Stage 3 cams, a revised air intake, and even a custom intake manifold to help reach our goal. THESE HEADS ARE ON AN EXCHANGE PROGRAM. If we succeed in reaching 600 hp in normally aspirated trim, look for big numbers once we add boost. Gen 3 Coyote Head Specs M-6049-M50B - Ford Performance Right Cylinder Head M-6050-M50B - Ford Performance Left Cylinder Head 205cc Intake Port Volume 55.9cc Chamber Volume (smaller versus 15-17 57cc) 37.7mm Intake Valve - 1.484-inch (.4mm larger than 15-17) 32mm Exhaust Valve -1.259-inch (.2mm larger than 15-17) The Parts We Used I'd love to see some real numbers though. Because the Coyote V-8 in all its forms has been in production a short time, its going to take time for used castings to become available. You can email the site owner to let them know you were blocked. Powered by BigCommerce All TEA head ports and chambers are hand blended in critical areas, and then flow tested to ensure they perform as designed. A CNC-machined Coyote exhaust port yields vastly improved flow over the roughcast stocker. -Chris, We offer both ported BOSS heads (ported over the stock CNC port) such as those used on the worlds fastest/2000HP MMR coyote and we also offer porting on stock GT heads. (Right) Here you can see MPR ported and polished intake ports. JPC and RGR completely disassemble the heads, including the valveguides, for maximum porting during the CNC process. JPC adds that turnaround time is approximately one week because they keep CNC castings in stock. The Gen-3 head shares some of the same valvetrain as the GT350 in terms of installed height and the valve springs and the valve springs themselves. Ive heard that boss heads don't have a lot left to port on them. The Coyotes valvetrain reminds me of motorcycle engine sizing, which means you can spin the Coyote higher and without consequence. It makes some serious horsepower, thanks to a 5.2L cross-plane crank and supercharger setup. With the release of the S650 Mustang, it was only natural that the Mustang gets a revised version of the Coyote. Justins best times in this Mustang have been as fast as 7.92 at 173.56 mph in the quarter-mile. This compares to just 166 cfm and 112 cfm (from port volumes of 127cc and 44cc). The 5.0 coyote engine has evolved over the years into the special variants versions powering some of the most legendary special-edition Mustangs. Any usage or mentions of these terms throughout our website and print ads are used for identification purposes only. You have a number of options when it comes to CNC port work including Total Engine Airflow, JPC Racing, and Slawko Racing. Exhaust flow with a 1 3/4 inch pipe and standard comp. Ford added new technology and tweaks to make the most powerful 5.0L Coyote. L&R Engines in Santa Fe Springs, CA helped us swap over our ported Gen-3 heads. Track Max Stage 2 camshaft set, .580 inch lift/234 duration @.050 inch. With CNC porting, you can gain as much as 25 to 40 cfm intake and 20 to 30 cfm exhaust. The engine increased displacement, all-new heads, and higher-lift cams contributed to the massive power increase. Truck won't get here for minimum 12 weeks so Im using that time to prepare accordingly. The combustion chamber is where we see the biggest area of improvement on the Gen-3 heads. Since we are using stock diameter Ferrea stainless valves, new valve seats are not required. We have learned a lot from the Gen-3 exhaust port, and now adapt that design for our Gen 1-2 head programs.. Thanks, RGR/JPC CNC Stage 3 Coyote 5.0 Cylinder Heads - Justin's Performance Center, http://www.summitracing.com/parts/tea-lm4vfs-r/overview/make/ford. Put into perspective, most street motors have BMEP numbers in the low-to-mid 170s with very powerful (high-compression) combinations touching 200. The GT350 heads exhaust ports are CNC precision machined, which offer excellent scavenging. Save your pennies to throw a power adder at one, and better rods, if you're scared. Ford Performance expects to have a complete 5.2L Coyote crate available by fall of 2016 that you can order with the cross-plane crank. Normalized for the difference between accessories, we netted 630.6 horsepower and 479.8 lb-ft, giving us an overall corrected gain of 26.5 horsepower and loss of 5.4 lb-ft. Eichhorn continued, We first find out the application the heads will be used for naturally aspirated, blower, or turbo. Traditionally, when you hear the phrase 5-Oh, most will think about the 87-93 Mustangs. Charge Motion changes intake manifold runner length via flapper valves in the intake manifold. Many have looked into completing a Coyote Swap into different Fords. JPC Racing- CNC Stage 3 Coyote 5.0 Cylinder Heads - Justin's Performance Center phone: 410-729-0005 Search Cart 0 Home All Parts Mustang Parts Shop Now! Our final Gen 3 Coyote update arrived in the 2021 F-150. A common question among the Mustang community is "What is different about the Coyote Mustang engines through out the years?" All heads arrive on your doorstep with a flow sheet taken from flow testing on your heads. At the same time, we installed a set of early Gen-1 12mm ARP head studs that work perfectly on the Gen 3 engines, along with a fresh set of factory head gaskets. Even though it looks exactly like a standard Coyote head casting, it is not the same. The original gen 1 coyote received many upgrades and cues from the 12-13 Boss, making this Coyote cleaner, more durable, and more powerful! After 10 years of circulating reused tap water while dyno testing, our electric water pump had finally given up the ghost when it was time to dyno. These CNC-ported heads are actually a joint venture between JPC Racing and Rich Groh Racing (RGR) Engines. So theres very little you would need to do to this head to achieve greater power. Neal has owned a 1996 3.8L, 2003 3.8L (Cobra Swapped), 2003 GT, 1998 3.8L (4.6L SOHC Swapped), 1990 GT Hatchback, 1990 GT Convertible, 2006 GT Single Turbo, and 2011 Twin Turbo/Cammed GT. Fords 5.0L Ti-VCT Coyote employs a revolutionary new cylinder head design that makes the latest member of the Modular engine less bulky while providing extraordinary breathing. HP and TQ? Each sensor is cam specific to prevent installation error. Livernois has some great ports for Coyote heads. It is understandable to expect big horsepower numbers from a four-valve motor, but what really impressed us was the torque production. The Stage 1 heads supplied by JPC and RGR featured full CNC porting. With 0-60 times coming in at 4.3 seconds, one 0.2 seconds behind the 5.4L Supercharged Shelby! Not compatible with OEM pistons. 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The 20112012 intake manifold does not fit. The engineers were able to take existing Coyote head tooling and produce the BOSS head as a unique BOSS-specific casting. Given our past experience with the valve float issue, we were excited about the increase in valvespring pressure. Expect to see in excess of 320 cfm intake and 220 cfm exhaust with these heads. SHARE THIS ARTICLE: Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. This engine dubbed the VooDoo used many new parts to make a bespoke engine that made 20% more horsepower than the Gen 2 GT coyote. The only real trick was making sure the cams were lined up properly. Stick aroundthis killer Coyote is about to grab that Road Runner and ring his little neck. After a brief warm up, we were rewarded with a significant jump in power. These changes include the following improvements and changes over the gen 1 Coyote variants. Below are some changes and improvements on the 2012-13 Boss 302 engine over the 2011-14 Mustang GT version. Road Runner was eventually applied to the track-inspired Boss 302 in 2012 and 2013 with its revised 5.0L engine! 2410 Ranger Hwy. Once again, the power came from Ford Racing in the form of a Boss intake manifold and matching throttle body. What Makes The F150 Truck Coyote Engine Different? However, these heads are still available from sources like Summit Racing Equipment, eBay, craigslist, and a host of others. Airflow improvement is in the 4- to 5-percent range. Regardless of what cylinder head you have planned for your Coyote project, the basics remain the same. Read More DART MACHINERY, INC. 2097 Bart Ave . With CNC-ported heads in place, we installed the Comp cams, lined up and installed the timing chains, and buttoned up the front and valve covers. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. The Gen III bore spacing is a conservative 4.46-inches, which limits the maximum bore size to roughly 4.100 inches, leaving a thin sealing space for the head gasket between cylinders.